Rotate the elements in an array in JavaScript

Question

I was wondering what was the most efficient way to rotate a JavaScript array.

I came up with this solution, where a positive n rotates the array to the

Answer 1

Not sure about the efficiency but I would do it in this non mutating way :

	Array.prototype.rotate = function( n ) {
  
		 return this.map( (item, index)=> this[ (this.length + index + n)%this.length ] )
	}